The IDF‘s Military Advocate General‘s Corps investigates pretty thoroughly and publishes the results. You can see those for Cast Lead here for example.

Their statement on the current war in Gaza is shorter.

Since the beginning of the current conflict, the MAG has ordered the launching of 74 criminal investigations regarding incidents that raised suspicion of criminal misconduct. Those include 44 criminal investigations concerning the death of detainees held by IDF (according to IDF’s long-standing policy, a criminal investigation is launched immediately regarding detainees’ death); 8 criminal investigations concerning alleged detainee mistreatment; 3 criminal investigations concerning alleged destruction of civilian property without military necessity; 13 criminal investigations concerning alleged pillaging or stealing of enemy ammunition found in Gaza; and 6 criminal investigations concerning alleged illegal use of force.

The current conflict is unprecedented in its intensity, scope and length, and the IDF has operated extensively through its course. Out of all the IDF’s extensive operational activity, more than a thousand incidents were identified as incidents that require factual assessment and were referred to the FFA Mechanism. Those incidents include, inter alia, incidents in which infrastructure and workers of aid organizations were allegedly harmed; incidents in which shelters were allegedly harmed; incidents in which critical infrastructure was allegedly damaged; incidents in which civilians were allegedly harmed; and incidents in which medical facilities and personal were allegedly harmed. So far, the FFA Mechanism has been collecting relevant material and documentation on hundreds of incidents in the context of the current war

Investigations take a while.

A press officer denying or deflecting early on simply doesn’t know yet what happened.